/Engine/Source/Runtime/MovieSceneTracks/Public/Sections/MovieSceneEventSectionBase.h
Delegate that is used to upgrade legacy event sections that need fixing up against a blueprint. Called on serialization and on compilation if necessary until successful upgrade occurs.
static [FUpgradeLegacyEventEndpoint](API\Runtime\MovieSceneTracks\Sections\UMovieSceneEventSectionBase\FUpgradeLegacyEv-) UpgradeLegacyEventEndpoint;